<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>todos</title>
  <script src="https://cdn.bootcss.com/vue/2.4.2/vue.js"></script>
  <style>
    .wrap{
      width: 400px;
      background-color: #ccc;
      margin: 0 auto;
    }
    i{
      color: #f00;
      font-size: 12px;
      margin-left: 20px;
      cursor: pointer;
    }
    i:hover{
      font-weight: 700;
    }
    ol{
      /*white-space: nowrap;*/
      word-wrap:break-word;
    }
    .done{
      text-decoration: line-through;
    }
    .not{

    }
  </style>
</head>
<body>
<div class="wrap" id="todos">
  <input type="text" v-model='nextItem' @keyup.enter='append'>
  <button id="append" @click='append'>添加</button>
  <ol>
    <li v-for='(item,index) of comp'
        :key=item.id
        :class='item.state ? "not" : "done"'>
      {{item.text}}
      <i @click='remove(index)'>完成</i>
    </li>
  </ol>
  <button @click='all'>全部</button>
  <button @click='done'>已完成</button>
  <button @click='todos'>待完成</button>
</div>
</body>
<script>
  var todos = new Vue({
    el:'#todos',
    data:{
      nextItem: '',
      nextID: 1,
      list: [],
      type: null,
    },
    computed:{
      comp:function(){
        if( this.type === 0 ){
          return this.list;
        }
        else if(this.type === 1){ //show all
          return this.list.filter(function(item){
            return true;
          })
        }
        else if(this.type === 2){ //done
          return this.list.filter(function(item){
            return item.state ? false : true;
          })
        }
        else if(this.type === 3){ //todos
          return this.list.filter(function(item){
            return item.state ? true : false;
          })
        }
      }
    },
    methods:{
      append:function(){//添加到todo
        this.list.push({
          id:this.nextID++,
          text:this.nextItem,
          state: true,
        });
        this.nextItem = '';
        this.type = 0;
      },
      remove:function(index){ //添加到donelist
        this.list[index].state = !this.list[index].state;
      },
      all:function(){
        this.type = 1;
      },
      done:function(){
        this.type = 2;
      },
      todos:function(){
        this.type = 3;
      }
    }
  });
</script>
</html>
